[PING][PATCH][gdb/testsuite] Fix gdb.guile/scm-type.exp with gcc 4.8
Tom de Vries
tdevries@suse.de
Thu Oct 7 14:34:45 GMT 2021
On 9/15/21 3:25 PM, Tom de Vries wrote:
> Hi,
>
> With gcc 7.5.0, I get:
> ...
> (gdb) guile (print (type-range (field-type (type-field (value-type \
> (value-dereference f)) "items"))))^M
> = (0 0)^M
> (gdb) PASS: gdb.guile/scm-type.exp: lang_cpp: test_range: \
> on flexible array member: $cmd
> ...
> but with gcc 4.8.5, I get instead:
> ...
> (gdb) guile (print (type-range (field-type (type-field (value-type \
> (value-dereference f)) "items"))))^M
> = (0 -1)^M
> (gdb) FAIL: gdb.guile/scm-type.exp: lang_cpp: test_range: \
> on flexible array member: $cmd
> ...
>
> There's a difference in debug info. With gcc 4.8.5, we have:
> ...
> <2><224>: Abbrev Number: 15 (DW_TAG_member)
> <225> DW_AT_name : items
> <22b> DW_AT_type : <0x231>
> <1><231>: Abbrev Number: 4 (DW_TAG_array_type)
> <232> DW_AT_type : <0x105>
> <2><23a>: Abbrev Number: 16 (DW_TAG_subrange_type)
> <23b> DW_AT_type : <0x11a>
> <23f> DW_AT_upper_bound : 0xffffffffffffffff
> ...
> and with gcc 7.5.0, we have instead:
> ...
> <2><89f>: Abbrev Number: 12 (DW_TAG_member)
> <8a0> DW_AT_name : items
> <8a6> DW_AT_type : <0x8ac>
> <1><8ac>: Abbrev Number: 17 (DW_TAG_array_type)
> <8ad> DW_AT_type : <0x29d>
> <2><8b5>: Abbrev Number: 41 (DW_TAG_subrange_type)
> <2><8b6>: Abbrev Number: 0
> ...
>
> As mentioned in commit 858c8f2c1b9 "gdb/testsuite: adjust
> gdb.python/flexible-array-member.exp expected pattern":
> ...
> Ideally, GDB would present a consistent and documented value for an
> array member declared with size 0, regardless of how the debug info
> looks like.
> ...
>
> As in gdb.python/flexible-array-member.exp, change the test to accept the two
> values.
>
> Tested on x86_64-linux.
>
>
> Any comments?
>
Ping.
Thanks,
- Tom
> [gdb/testsuite] Fix gdb.guile/scm-type.exp with gcc 4.8
>
> ---
> gdb/testsuite/gdb.guile/scm-type.exp | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gdb/testsuite/gdb.guile/scm-type.exp b/gdb/testsuite/gdb.guile/scm-type.exp
> index ccde98ca224..e5eaab365cc 100644
> --- a/gdb/testsuite/gdb.guile/scm-type.exp
> +++ b/gdb/testsuite/gdb.guile/scm-type.exp
> @@ -267,7 +267,7 @@ proc test_range {} {
> gdb_scm_test_silent_cmd "guile (define f (history-ref 0))" \
> "get value (f) from history"
> gdb_test "guile (print (type-range (field-type (type-field (value-type (value-dereference f)) \"items\"))))" \
> - "= \\(0 0\\)"
> + "= \\(0 (0|-1)\\)"
> gdb_test "guile (print (value-subscript (value-field (value-dereference f) \"items\") 0))" \
> "= 111"
> gdb_test "guile (print (value-subscript (value-field (value-dereference f) \"items\") 1))" \
>
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